MAX1491(2003) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1491 Datasheet PDF : 25 Pages
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3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
Pin Description (continued)
PIN
MAX1491
MAX1493
MAX1495
21
18
22
19
23
20
24
21
25
25
26
26
27
27
28
29
—
22
—
23
—
24
—
28
NAME
SEG7
SEG8
SEG9
SEG10
BP3
BP2
BP1
VNEG
SEG11
SEG12
SEG13
DPON
FUNCTION
LCD Segment 7 Driver
LCD Segment 8 Driver
LCD Segment 9 Driver
LCD Segment 10 Driver
LCD Backplane 3 Driver
LCD Backplane 2 Driver
LCD Backplane 1 Driver
-2.5V Charge-Pump Voltage Output. Connect a 0.1µF capacitor from VNEG to GND.
LCD Segment 11 Driver
LCD Segment 12 Driver
LCD Segment 13 Driver
Decimal Point Enable Input. Controls the decimal point of the LCD. See the Decimal Point
Control section. Connect to DVDD to enable the decimal point.
AVDD DVDD
MAX1493
MAX1495
+2.5V
AIN+
AIN-
INPUT
BUFFERS
REF+
REF-
-2.5V
DPON HOLD DPSET1 DPSET2 RANGE PEAK INTREF
CONTROL
ADC
BINARY-TO-BCD
CONVERTERS
AND
LCD DRIVERS
SEG1
SEG13
BP1
BP2
BP3
2.048V
BANDGAP
REFERENCE
OSCILLATOR/
CLOCK
+2.5V
-2.5V
A = 1.22
CHARGE
PUMP
TO
CONTROL
GND
Figure 1. MAX1493/MAX1495 Functional Diagram
VNEG
LOWBATT
8 _______________________________________________________________________________________
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